Taking their romance to new heights!

Ashton Kutcher and Mila Kunis aren't hiding their relationship anymore -- they're flaunting it. The former That '70s Show costars arrived for a departing flight out of Denspasar Airport in Bali on Sunday holding hands after enjoying a romantic vacation together for the past week.

PHOTOS: Ashton's love life

While neither sported a smile, they both sported nice new tans from their fun in the sun. Kutcher, 34, wore a pink dress shirt, white pants and a fedora, while Kunis, 28, showed a glimpse of her toned tummy in a short sweater and boyfriend khakis.

PHOTOS: Mila's sexy transformation

After hiding their relationship for the past three months, the couple is finally stepping out as a couple. Kutcher split from his wife Demi Moore after six years of marriage last November, and Kunis has been single since late 2010 when she and Macaulay Culkin quietly ended their eight-year relationship.

PHOTOS: Costar couples

"Mila is throwing caution to the wind!" a source told Us Weekly of Kunis. "She's having fun."

This article originally appeared on Usmagazine.com: PIC: Ashton Kutcher, Mila Kunis Hold Hands After Romantic Vacation in Bali